The difference between raster and vector graphics comes down to what the file is actually made of. A raster file is a grid of colored pixels. A vector file is a set of mathematical instructions for drawing shapes. That one distinction explains almost every practical problem you have ever had with a logo, a print job, or a blurry image on a website.
This guide covers what each type is, which formats belong to which, when to use them, and what to ask for so you stop paying twice for the same artwork.
Key Takeaways
- Raster images are pixel grids with a fixed resolution. Enlarge one and it degrades.
- Vector images are math based paths. They scale to any size with no loss of quality.
- Photographs are always raster. Logos, icons, and illustrations should almost always be vector.
- You can convert vector to raster in seconds. Going the other direction means redrawing the artwork.
- Ask for your logo in AI or EPS plus SVG. Without a vector master you will hit a wall eventually.
Raster and Vector Graphics Explained in Plain Terms
Both end up as something you can look at. How they get there is completely different, and that difference determines what you can do with the file later.
What a Raster File Really Is
A raster image is a rectangular grid of pixels, each assigned a color. A photo at 3000 by 2000 pixels contains six million of them. Because the number of pixels is fixed when the file is created, enlarging the image just makes each pixel bigger. Software can guess at the in between values, but it cannot invent detail that was never captured.
This is why a small logo pulled off a website looks soft when someone drops it into a banner. Nothing is broken. There was simply never enough information in the file for that size.
What a Vector File Really Is
A vector file stores instructions instead of pixels: place an anchor point here, curve to there, fill this shape with this color. Your computer redraws those instructions at whatever size you request. Print it on a business card or on the side of a building and the edges stay perfectly sharp, because the artwork is recalculated each time rather than stretched.
The tradeoff is that vectors cannot describe the subtle, irregular detail of a photograph. Try and you either get something stylized or a file so complex it becomes unusable.
The File Formats You Will Actually Encounter
Format confusion causes more wasted time than the underlying concept does. Here is the short version.
One quick way to tell them apart: if it is a format you would email a photo in, it is raster. If it is a format a printer or a designer asks you for, it is usually vector.
Common Raster Formats
- JPG: photos on the web, small file size, lossy compression, no transparency
- PNG: screenshots, graphics needing transparency, larger files than JPG
- WEBP: modern web format, better compression than both, now widely supported
- GIF: limited to 256 colors, useful only for simple animation
- TIFF: high quality print photography, very large files
- PSD: the layered Photoshop working file, not a delivery format
Common Vector Formats
- AI: the native Adobe Illustrator working file, usually your true master
- EPS: older exchange format, still what many printers request
- SVG: the web standard for vector, small, sharp, and styleable with code
- PDF: can hold either type, and holds vector data if it was exported correctly
That last point trips people up constantly. A PDF is a container, not a guarantee. A PDF built from a scanned page contains a raster image and is no more scalable than a JPG. The format documentation maintained at the W3C SVG page is a good reference if you want to understand what vector data on the web actually contains.
Resolution, DPI, and Why Your Logo Looks Blurry
Resolution only applies to raster files, which is a large part of why the two get confused.
DPI, or dots per inch, describes how densely pixels are packed when an image is printed. Screens generally work fine around 72 to 96 pixels per inch. Commercial printing typically wants 300 DPI at final size. A 500 pixel wide image printed at 300 DPI covers about an inch and two thirds. Print it four inches wide and quality falls apart.
You cannot fix this by changing the DPI setting in an export dialog. That setting only tells the printer how to space the pixels you already have. Increasing it without more pixel data just spreads the same information across a larger area. Adobe covers the underlying concepts in the documentation at the Adobe Help Center if you want to go deeper.
A useful rule of thumb: multiply the printed width in inches by 300 to get the pixel width you need. A six inch wide image on a brochure wants roughly 1800 pixels across. Check that before anything goes to print and you will avoid most reprints.
Vector artwork sidesteps all of it. There is no DPI, because there are no pixels until the moment something is rendered or printed.
When to Use Raster and Vector Graphics
The decision is usually obvious once you know which question to ask: does this artwork need to work at sizes you have not thought of yet?
Use Vector For
- Logos and wordmarks, without exception
- Icons and interface symbols
- Illustrations with flat color and clean shapes
- Signage, vehicle wraps, and anything large format
- Embroidery, screen printing, engraving, and die cutting
- Charts and diagrams that may be resized or edited later
Use Raster For
- Photography of any kind
- Complex textures, gradients, and painted artwork
- Screenshots and product photos
- Social media images, which are delivered at fixed pixel sizes anyway
- Anything with photographic depth of field or realistic lighting
Plenty of real projects mix both. A billboard might use a vector logo sitting on top of a high resolution photograph. That is normal and correct. What you want to avoid is the reverse: a photographed or screenshotted logo pasted onto a print piece.
What This Means for Your Website
On the web, both types have a job, and choosing badly costs you page speed.
Use SVG for logos, icons, and simple illustrations. The files are tiny, they stay crisp on every screen density, and you can change their color with CSS instead of exporting six versions. Use WEBP or JPG for photography, sized to the largest dimension it will actually display at, never a 4000 pixel image squeezed into a 600 pixel slot.
Oversized raster images are one of the most common causes of slow pages we find during audits. The image looks identical to the visitor and costs several times the bandwidth. Compress before uploading, serve modern formats, and let vector handle everything it can. We build sites this way as standard through our web design services.
Start With the Logo in Your Header
The header logo appears on every single page, which makes it the highest leverage image on the site. If it is a PNG scaled down from something enormous, every visitor downloads that weight on every page view. An SVG in the same slot is usually a fraction of the size and looks sharper on high density screens.
Converting Between the Two
One direction is trivial. The other is a project.
Vector to Raster Is Simple
Export at whatever pixel dimensions you need. Because you started with scalable artwork, you can produce a favicon, a social avatar, and a print ready file from one source in a couple of minutes. This is exactly why the vector master matters so much.
Raster to Vector Is a Rebuild
Auto trace tools in design software can approximate a shape, and the result is usually rough: wobbly curves, wrong corner angles, colors that are close but not correct. For a logo, the honest fix is redrawing it properly from the original design. Budget an hour or two of a designer time and get a clean master you own forever.
If you have lost your source files, this is worth doing once rather than repeatedly paying for workarounds. You can see how consistent asset quality carries through a full brand rollout in our portfolio of client projects.
What to Ask Your Designer For
When a logo project wraps up, ask for a package that covers every future use:
- The vector master in AI or EPS, with fonts converted to outlines
- SVG versions for web use, in full color and single color
- PNG exports with transparent backgrounds at several sizes
- A one color and a reversed version for dark backgrounds
- A short note listing color values in hex, CMYK, and Pantone
If a designer will only hand over JPGs and PNGs, that is a warning sign. You should own the source artwork for anything you paid to have created, because without it every future change starts from scratch.
Store that package somewhere durable and shared, not in one person email inbox. Source files that live only on a former employee laptop are effectively gone the day they leave.
Frequently Asked Questions
Can I turn a JPG logo into a vector file?
Not cleanly with automation. Auto trace produces approximate curves and imprecise colors, which shows immediately at large sizes. The reliable path is redrawing the logo as true vector artwork, usually an hour or two of work. Do it once and you will never face the problem again for that mark.
Is a PDF a vector file?
Sometimes. PDF is a container that can hold vector paths, raster images, or both. A PDF exported from Illustrator with the artwork intact is vector. A PDF made by scanning a printed page contains a raster image only. Open it and zoom in to 800 percent. If edges stay sharp, it is vector.
Why does my logo look pixelated on my website?
Almost always because a small raster file is being displayed larger than its native size, or because a standard resolution PNG is showing on a high density screen. Switching the logo to SVG fixes both at once and usually reduces file size in the process. It is a ten minute change with a visible result.
Which format should I send to a printer?
Ask them, then send vector where possible. Most commercial printers want a PDF or EPS with fonts outlined and colors specified in CMYK or Pantone. For photographic content, supply raster at 300 DPI at final print size. Sending the wrong format is the most common cause of last minute delays.
Choosing the Right Format Every Time
Remember the core rule and most decisions answer themselves. Anything drawn, such as a logo, icon, or diagram, belongs in vector. Anything captured, such as a photograph, belongs in raster. Keep the vector masters somewhere safe, export raster versions as you need them, and never let a screenshot of your logo end up on something printed.
If your logo files are a mess or you are not sure what you actually own, our graphic design team can sort out the artwork and build you a proper asset package.
